I walked Flash up to the schoolyard a few blocks away. The snow now has about a 1/2" layer of ice on top. It breaks right away when I step on it, but Flash can walk across the top if he's careful, but if he tries to go too fast, he breaks through and has to plow through a bit.

While he was playing fetch, I broke some big pieces of the surface ice and stood them up in the snow. The thin ice is really fragile, so some of the bigger pieces fell over or broke when I tried to place them. Most broke when I tried to pick them up, so this is all I ended up with.